[R] beginner's question: group of regressors by name vector?

[David Freedman]

The predictors and outcomes in lm can be matrices, so you could use something
like the following:
 
x.mat=cbind(x1=rnorm(20),x2=rnorm(20))
y.mat=cbind(y1=rnorm(20),y2=rnorm(20))
lm(y.mat~x.mat)

David Freedman

ivowel wrote:
> 
> dear r-experts: there is probably a very easy way to do it, but it eludes  
> me right now. I have a large data frame with, say, 26 columns named "a"  
> through "z". I would like to define "sets of regressors" from this data  
> frame. something like
> 
> myregressors=c("b", "j", "x")
> lm( l ~ myregressors, data=... )
> 
> is the best way to create new data frames that contain all the variables I  
> want, then use ".", and then destroy them again? or am I overlooking  
> something obvious?
> 
> sincerely,
> 
> /iaw
> 
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> 
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